<template>
	<view>
    <person-search @click="handleClick"></person-search>
    <!-- 布局盒子 -->
		<view class="scroll-view-container">
      <!-- 左侧导航滚动 -->
      <scroll-view class="left-scroll-view" scroll-y :style="{height: wh+'px'}">
        <block v-for="(item,index) in cateList" :key="index">
          <view class="left-scroll-view-item" @click="changeIndex(index)" :class="{active:index===activeIndex}">{{item.cat_name}}</view> 
        </block>
      </scroll-view>
      <!-- 右侧导航滚动 -->
      <scroll-view class="right-srcoll-view" scroll-y :style="{height: wh+'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2, i2) in cateListLv2" :key="i2">
            <view class="right-lv2-title">/ {{item2.cat_name}} /</view>
            <!-- 动态渲染三级分类的列表数据 -->
            <view class="cate-lv3-list">
              <!-- 三级分类 Item 项 -->
              <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="goToGoodsDetail(item3.cat_id)">
                <!-- 图片 -->
                <image :src="item3.cat_icon"></image>
                <!-- 文本 -->
                <text>{{item3.cat_name}}</text>
              </view>
            </view>
          </view>
      </scroll-view>
    </view>
	</view>
</template>

<script>
  import cartBadge from '@/mixins/tabbar-badge.js'
	export default {
    mixins:[cartBadge],
		data() {
			return {
        // 滚动的视口高度
				wh:0,
        // 一级分类列表
        cateList:[],
        // tab栏切换索引
        activeIndex:0,
        // 二级分类列表
        cateListLv2:[],
        // tab栏切换时，滚动条返回顶部
        scrollTop:0
			};
		},
    onLoad() {
      // 获取页面可视口高度
      const sysInfo = uni.getSystemInfoSync()
      // console.log(sysInfo)
      this.wh = sysInfo.windowHeight-60
      
      // 调用获取分类列表数据函数
      this.getCateList()
    },
    methods:{
      // 封装获取分类列表数据函数
      async getCateList() {
        const {data:res} = await uni.$http.get('/api/public/v1/categories')
        if(res.meta.status !== 200) return uni.$showMsg()
        this.cateList = res.message
        // 二级分类列表默认渲染第一项
        this.cateListLv2 = res.message[0].children
      },
      // 实现tab栏切换
      changeIndex(index) {
        this.activeIndex = index
        // 当用户切换分类时，对应二级分类列表跟着切换
        this.cateListLv2 = this.cateList[index].children
        // tab栏切换时，滚动条返回顶部
        this.scrollTop = this.scrollTop===0?1:0
      },
      // 点击3级列表跳转到商品详情页
      goToGoodsDetail(id) {
        uni.navigateTo({
          url:'/subpkg/goods_detail/goods_detail?cid='+id
        })
      },
      // 点击搜索栏跳转到搜索页
      handleClick() {
        console.log('跳转到搜索页')
      }
    }
	}
</script>

<style lang="scss">
.scroll-view-container {
  display: flex;
  .left-scroll-view {
    width: 150rpx;
    .left-scroll-view-item {
      line-height: 60px;
      text-align: center;
      font-size: 12px;
      background-color: #F7F7F7;
      &.active {
        background-color: #fff;
        position: relative;
        &::before {
          content: ' ';
          position: absolute;
          width: 3px;
          height: 30px;
          background-color: #C00000;
          left: 0;
          top: 50%;
          transform: translateY(-50%);
        }
      }
    }
  }
}
.right-lv2-title {
  font-size: 12px;
  font-weight: 700;
  text-align: center;
  padding: 15px 0;
}
.cate-lv3-list {
  display: flex;
  flex-wrap: wrap;
  .cate-lv3-item {
      width: 33.33%;
      margin-bottom: 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
  
      image {
        width: 60px;
        height: 60px;
      }
  
      text {
        font-size: 12px;
      }
    }
}
</style>
